Stability, viscous dissipation and local thermal non-equilibrium in fluid saturated porous media

Celli, Michele (2010) Stability, viscous dissipation and local thermal non-equilibrium in fluid saturated porous media, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Ingegneria energetica, nucleare e del controllo ambientale, 22 Ciclo. DOI 10.6092/unibo/amsdottorato/2485.
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In this thesis, the field of study related to the stability analysis of fluid saturated porous media is investigated. In particular the contribution of the viscous heating to the onset of convective instability in the flow through ducts is analysed. In order to evaluate the contribution of the viscous dissipation, different geometries, different models describing the balance equations and different boundary conditions are used. Moreover, the local thermal non-equilibrium model is used to study the evolution of the temperature differences between the fluid and the solid matrix in a thermal boundary layer problem. On studying the onset of instability, different techniques for eigenvalue problems has been used. Analytical solutions, asymptotic analyses and numerical solutions by means of original and commercial codes are carried out.

Tipologia del documento
Tesi di dottorato
Celli, Michele
Dottorato di ricerca
Scuola di dottorato
Ingegneria industriale
Settore disciplinare
Settore concorsuale
Parole chiave
Linear stability, Porous medium, Viscous dissipation, Darcy model, Forchheimer model, Local thermal non-equilibrium.
Data di discussione
17 Maggio 2010

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